tsetse

例句：

1. 1. The tsetse fly is the vector of malaria.
   蚊子是疟疾的传播媒介。
2. 2. Malaria has been a major public health concern in many parts of Africa.
   疟疾一直是非洲许多地区的重大公共卫生问题。
3. 3. Insecticides are used to control the tsetse fly population.
   使用杀虫剂来控制蚊子的数量。